Process of reclaiming rubber waste.



F. L. KRYDER & E. W. SNYDER PROCESS OF RECLAIMING RUBBER WASTE.

APPLICATION FILED IAN. 4.19M!- Patented Apr. 23,1918.

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UNITED STATES PATENT OFFICE.

mm L. RYDER, 0F ARBOR, OHIO, AND EDGAR. W. SNYDER, OI INDIANAPOLIS,INDIANA.

PROCESS OF BECLAIMING RUBBER WASTE.

Specification of Letters Patent.

Patented Apr. 23, 1918.

To all whom it may concern:

Be it known that we, FRANK L. Karma and EDGAR W. SNYDER, citizens of theUnited States, residing at Akron, in the county of Summit and State ofOhio, and Indianapolis, in the county of Marion and State of Indiana,respectively, have invented certain new and useful Improvements inProcesses of Reclaiming Rubber Waste, of which the following is aspecification.

Our invention relates to a process of reclaiming rubber waste.

An important object of the invention is to provide means for treatingrubber waste, for obtaining therefrom reclaimed rubber of a high de.

Other 0 jects andadvantages of the invention will be apparent during thecourse of the following description.

In the accompanying drawing forming a part of this specification, thefigure is a central vertical longitudinal section through apparatusembodying our invention, parts being shown in e evation.

In the drawing, wherein for the purpose of illustration is shown apreferred embodiment of our apparatus, the numeral 1 deslgnates a closedrotatable digester or casing, comprising an outer shell 2 and an innershell 3, arranged in spaced relation, to form a heating chamber orjacket, as shown. The shells 2 and 3 are rigidly connected by means ofstay-bolts or rivets 4.

Extending through openings in the ends of the outer shell 2 are tubularshafts 5, having their inner ends provided with annular flanges 6, whichare bolted or otherwise rigidly connected with the shell 2. Surroundingthe tubular shafts 5 and contacting with the ends of the shell 2 arerings 7, which are preferably rigidly clamped to the tubular shafts 5. V

The tubular shafts 5 are journaled throu h bearings 8, supported byup-rights as s own.

The shell or digester l is provided with man-holes which are surroundedby flanged plates 10, formed U-shaped in cross-section. These plates 10.are secured to the shells 2 and 3 by any suitable means. The openings ofthe flanged plates 10, which are preferably circular are adapted to beclosed by covers 11, contacting with the inner sides thereof. Thesecovers carry bolts 12, extending outwardly, and passing through open-T-couplinf ings in bars 14. These bolts have their outer endsscrew-threaded to receive nuts 15, as shown. [I

The numeral 16 designates a safety valve, leading into the space betweenthe shells 2 and 3. Leading into the space between the shells 2 and 3 1sa thermometer 17 of any well known or preferred type.

The numeral 18 designates a ulley rigidly secured to one tubular shat15. This pulle ma be rotated by any suitable means. xten ing into andthrough one tubular shaft 15, is a steam supply pipe 19 equipped with acut off valve 20. The steam supply pipe discharges into the space orjacket between the shells 2 and 3.

Extending into and through the other tubular shaft 5 is a liquid supplypipe 21, leading into the interior of the shell 3, as shown. The pipe 21is equipped with a cut oil valve 22 and has connection with a T-coupling 23, connected with a liquid supply pipe 24; The pipe 24 isconnected with a force pump 25* for forcing liquid under pressure intothe digester, and between this pump and the T couplin 23 is located acheck valve 25. A out o valve 26-, is connected in the pipe 21,outwardly of the coupling 23. Connected in the pipe 21. is a secondT-coupling 27, havin connection with a pipe 28 connected witIi apressure gage 29. Connected in the pipe 21 is a third 30, havingconnection with a second liqui supply Xlp 31 equipped with a cut offvalve 32. cut oif valve 33 is connected in the pipe 31 and is arrangedout wardly of the coupling 30.

Arranged beneath the shell of the digester 1 and in transverse alinementwith the manholes, is a tank or well 33, having inclined bottom walls34, discharging into a collecting pocket 35, having communication with apipe 36.

11 preparing the rubber waste for treatment, in accordance with ourprocess, it is first treated by any well known or preferred 7 method toremove therefrom cloth, sand, dirt, metal or other foreign substances,and is thoroughly disintegrated as by being ground or finel divided.

In the practice of our rocess, the disintegrated rubber waste, .reedfrom cloth, sand,dirt, metal and the like, as described, is treated witha mixture of anilinoil, rub ber resin, and a mineral solvent, preferablymineral hydrocarbon, an

a mineral hydrocarbon, such as gasolene or kerosene, to which mixturemay be advant ageously added carbolic acid. This mixture will behereinafter referred to as solution A. In the preferred ractice of ourprocess the disintegrated rub rwasteissubected to treatment with amixture of anilin oil, rubber resin, mineral h droca'rbon and carbolicacid in the prefer proportions of parts by weight of anilin oil 10partsjby weight of rubber resin, 2 arts by weight of 1 part by weight ofcarbolic acid. This tre tment is carried out in a'digester at anelevifled temperature, preferably at a temperature of approximately 307to 390 F., for approximately an hour or longer, depending upon thecharacter or condition of the rubber waste. In the the valve 20 is obeen com leted, a 'solutio 06 indicates a sufic'ient amount of intreatment of rubber waste ordinarily encountered the treatment may beadvantageously continued for an hour and a half under a pressure ofpreferably 60 pounds per square inch.

The resulting mass is then pased through one of the man-holes into theinner shell 3, together with a suflicient amount of water, to producethe desired results. .We have fourfid trlifi', osaahtilsfacto resultsare ordina'yp u yempoym'g25to 5parts by weight of water to 100 arts bywei ht of the mass. The man-hole 13 then clo and pened, while the valve22' is closed. Steam is now admitted into the space or jacket betweenthe shells 2 and 3 to heat the mass without such steam coming intodirect contact with the mass under treatment. this heating operationpower is applied to the rotates the entire shell or 1, thereby,subjecting the mass to thorough and violent agitation.

The mass, while be' heated, within the inner shell 3 is preferiiblymaintained under apressureoffrom60to100poundstothe square inch dependingupon the character or condition of the rubber waste, and this heatingoperation is ordinaril continued from six to ten hours. operation hashereinafter termed so ution B, is in need into the mass. This solutionreferably contains an organic acid preferab y acetic acid,

I tine and a mineral solvent, preferably naph tha. We prefer to employin solution B 5 parts weight of acetic acid, 1 part by weight 0turpentine, and 2 parts by weight of naphtha. Solution B is pumped intothe shell 3 by inea-ns of a force pum through the pipe 24, the valve 22This solution B is forced into 0 ed. tli e inner shell 3 until thepresure gage 29 ulley 18, which usly be 125 The object to pzoduce asuperior grade of reclaimed rub r waste.

After the desired increased pressure is obtained the valve 22 may beclosed, the digester 1 rotated and'heated as hereinabove described.

It will be apparent that the initial treatment of the disintegratedrubber waste with solution A may be advantageously conducted in thedigester illustrated. When this is done, valves 23 and 25 being closedand valves 22, 26 and 32 being opened, the solution is admitted throughpipes 31 and 21 to the inner shell 3, and the rubber waste heatedtherein by means 01 steam admitted to the steam jacket through pipe 19.It will also be apparent that the water added to the mass resulting fromthe treatment of the rubber waste with solution A may be admittedthrough pipe 21 and that the entire treatment of thedisintegrated rubberwaste may be conveniently conducted in our apparatus.

The uantities of solution A and solution B which we employ, vary withthe character and condition of the rubber waste,

derstood that the detalls of procedure, tem-.

peratures employed and proportions of ingredients of reagents recitedmay be widely varied and that chemical equiv cuts of the materials usedmay be employed, all w1thout departing from the spirit of our mventionor the scope of the subjoined claims.

thus described our invention, we

1. The herein described procex, which consists in subjecting rubberwaste to the action of a solution in the presence of heat and agitationand underi-pressure "exceeding atmospheric pressure, and introducingunder pressure a second reclaiming solution into the mass for increasthepressure thereon without substan-- y increasing its tem rature, andseparating the reclaimed rub from the liquid mass.

2. The herein described process, which consists in sub'ecting rubberwaste to the action of a rec solution subjectin the mass topressmm v60to 100 pound per square inch while heating thesamt for six to ten hours,and introducing under pressure a second reclaiming solution into themass for increasing the pressure thereon without substantiallyincreasing its temperature, and separating the reclaimed rubber from theliquid mass. 1

3. The herein described process, which consists in subjecting rubberwaste to the action of a reclaiming solution comprising anilin oil,rubber resin, and a mineral solvent, in the presence of heat andagitation and under pressure exceeding atmospheric pressure; introducingunder pressure a second reclaiming solution comprising an organic acid,turpentine, and a mineral solvent, into the mass for increasin thepressure thereon without substantial y increasing its temperature, andseparating the reclaimed rubber from the liquid mass.

4. The herein described process, which consists in subjecting rubberwaste to the action of a reclaimin solution comprising anilin oil,rubber resin, and a mineral hydrocarbon, in the presence of heat andagitation, and introducing into the mass a second reclaiming solutioncomprising acetic acid, turpentine, and na htha.

5. The herein descri d process, which consists in subjecting rubberwaste to the action of a reclaiming solution comfprising substantially-10 parts by weight 0 anilin oil, 10 parts by wei ht of rubber resin,and 2 parts by weight 0 a mineral hydrocarbon, in the presence of heatand a 'tation; introducing into the mass a secon reclaiming solutioncomprising substantiall 5 parts by Weight of acetic acid, 1 part ywelght of turpentine, and 3 parts by weight of na ht-ha; and separatingthe reclaimed rub er from the liquid mass.

6. The herein described process, which consists in subiecting rubberwaste to the action of a rec aiming solution comprising substantially 10parts by weight of anilin oil, 10 parts by weight of rubber resin, 2parts by weight of a mineral hydrocarbon, and 1 part by weight ofcarbolic acid, in the presence of heat and agitation; introducing intothe mass a second reclaiming solution comprising 5 parts by weight ofacetic acid, 1 part b weight of turpentine, and 3 parts by weig t ofnaphtha; and separating the reclaimed rubber from the liquid mass.

In testimony whereof we afiix our signatures.

FRANK L. KRYDER. EDGAR W. SNYDER.

